syslogd in the syslog subsystem in Apple iOS before 8 and Apple TV before 7 allows local users to change the permissions of arbitrary files via a symlink attack on an unspecified file.
http://archives.neohapsis.com/archives/bugtraq/2014-09/0106.html
http://archives.neohapsis.com/archives/bugtraq/2014-09/0107.html
http://support.apple.com/kb/HT6441
http://support.apple.com/kb/HT6442
http://www.securityfocus.com/bid/69882
http://www.securityfocus.com/bid/69923